Economizer



May 28, 1929.

H. J. KERRTI-IT AL ECONOMIZER Filed Jan. 24, 1927 INVENTOR ATTORN EYSPatented May 28, 1929.

uurran STATES 1,715,037 PATEN QFFICE.

HOWARD J. KERR, 0F WESTFI'ELD, NEW JERSEY, AND JAMES E. TRAINER, 0]?BAR- BERTON, OHIO, ASSIGNORS TO THE BABCOCK & WILCOX COMPANY, OFBAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

ECONOMIZER.

Application filed January 24, 1927. Serial No. 162,966. 1

I This invention relates to economizers in which the tubes are coatedwith material to prevent corrosion. The invention will be understoodfrom the description in connection with the accompanying drawings inwhich Fig. 1 is a side elevation, partly broken away, showing theeconomizer; Fig. 2 is a view on an enlarged scale showing a section,partly broken away, through the economizer; Fig. 3 is a section alongthe line 3-3 of Fig. 2; Fig. 4 is a sectional view similar to Fig. 2showingia modification; Fig. 5 is a section along the line 55 of Fig. 4,and Fig. 6 is a sectional view showing one of the details.

It has been found that the tubes of economizers are very apt to becorroded in use and for this reason it is desirable to coat the samewith material, such as glazed material similar to enamel, that willprevent corrosion. At the same time, it is inadvisable to extend thecoating material entirely to the ends of the tubes, because the samewill be displaced or cracked ofi when itis attempted to expand the endsof the tubes into the headers. By the present invention the coatingmaterial terminates short of the headers and a wall, which constituteone of the sides of the gas passage across which the tubes of theeconomizer are located, is placed near the headers, and the tubes extendthrough this wall so that the coating on the material terminates betweenthis wall and the headers and, at the same time, a gas-tight connectionis made between this wall and the portionsof the tubes upon which thereis coating material.

In the drawings, reference character 10 indicates the headers of aneconomizer which, in this illustrated embodiment of the invention, isshown with U-tubes 11 connecting the headers, the headers exemplifyingconnections for the tubes. One wall of the gas passage across which thetubes 11 extend isshown at 12 close to the bends of the U-tubes, and theopposite wall of this gas passage is shown at 13 spaced :1 shortdistance from the headers 10 and extending across the tubes 11.

The tubes 11 pass through the wall 13 and gas-tight joints are providedbetween the tubes and the wall. As shown in'Figs.-2 and 3, the wall 13is made up of pairs of plates 14 that are slightly spaced apart with theedges of the pairs of plates connected by means of bolts 15. The coatingmaterial, which may, for example, be. a vitreous enamel, covers theentire tubes except for a short distance from the ends thereof, whichare expanded into the headers 10. As clearly shown in Fig. 3, thiscoating material terminates between the wall 13 and the headers 10. Thegas-tight joint between the wall 13 and the coating 16 on the tubes 11is made, as shown in Fig. 2, of washers 17 that fit the outside of thecoating 16 very closely and are located between the respective pairs ofplates 14 and thereby kept in place' to prevent gas from escaping fromthe gas passageand coming into contact with the bare portions of thetubes near their ends as well as the headers 10.

In the modification shown in Figs. 4, 5 and 6, the wall 13 is made up ofsingle plates 18 that are connected along their edges by means 7 i ofthe bolts 19 and thegas seal is made up of thimbles 20, one end ofwhich, as shown at 21, fits closely around the outside of the enamel 16on the tubes and the other end 22 is made somewhat conically shaped soas to provide a gas-tight joint with the plate 18. If desired, packingmaterial 23 (Fig. 6) may be placed in the thimbles 20 to make agas-tight joint between the thimbles 20 and the tubes 11, when thethimbles themselves do not.

The coating material may be applied to the tubes either before or afterthey are expanded into the headers, and may consist of glazed orvitreous material or of plating that will prevent the tubes fromcorrosion due to fumes or acids from the gases that contact with thetubes, and will also withstand the elevated temperatures in theeconomizers as well as prevent the tubes from becoming rusty because ofthe fact that water or steam is periodically sprayed over them to cleanoff the dust and soot that has lodged thereon. Since tions of the tubesand headers from the fumes and acids but also from the steam and waterused for cleaning the tubes.

We claim:

1. In an economizer, headers, tubes coated with non-corrodiblematerialconnected to said headers and having their ends free from said coatingmaterlal, a wall near said headers withnon-corrodible material connectedto said headers, a wall near said headers through which said tubes pass,and gas-tight seals between said tubes and wall, the coating on saidtubes terminating between said wall and said headers.

3. In an economizer, headers, tubes coated with non-corrodible materialconnected to said headers, a wall near said headers through which saidtubes pass, and gas-tight seals between said tubes and wall, eachcomprising a ring-shaped portion fitting tightly around.

, the pass but-uncoated where they are joined to the coating on saidtubes.

4. In an economizer, headers, tubes coated with non-corrodible materialconnected to said headers, a wall near said headers through which saidtubes pass, and gas-tight seals between said tubes and wall, eachcomprising a ring-shaped portion fitting tightly around the coating onsaid tubes and another portion forming a gas-tight sealwith said wall.

, 5. In combination, means defining a gas pass, a connection having atube joined thereto at one end and extending into said pass,

the tube on its coated portion and preventing gases reaching theuncoated portion.

'7. In combination, two tubes extending.

into a gas pass and having ends disposed outside of said pass on oneside thereof, and a connection also disposed outside of said pass andjoining said tube ends, said tubes being coated with non-corrodiblematerial within said connection.

8. In combination, means defining a gas.

pass, a connection having a tube joined thereto at one end and extendinginto said pas's,said tube being coated with non-corrodible materialwithin the pass but uncoated therewith where it is oined to theconnection, and means preventing gases from said pass reaching theuncoated part of the tube.

HOWARD J. KERR. JAMES E. TRAINER.

DISCLAI M ER I A 1,715,037.-H0ward J. Kerr, Westfield, N. J., and JamesE. Trainer, Barberton,

Ohio. ECONOMIZER.

Patent dated May 28, 1929.

Disclaimer filed October 23, 1929, by theassignee, The Babcock at"Wilcox Company. Hereby enters this disclaimer to the combination ofelements set forth in each of claims 5 and 7 of said Letters Patentexcept when the non-corrodible material of said elements is one which ischemically neutral with respect to the material of the tube or tubes andwhich is applied to the outside thereof and caused to adhere thereto,leaving the material of the tube or tubes unchanged.

[Ofiicial Gazette November 12, 1.929.]

. D ISO LAI M E R 1,715,037.H0ward J. Kerr, Westfield, N. J., and JamesE. Trainer, Barberton,

Ohio. EcoNoMIzER.

Patent dated Mav 28, 1929. Disclaimer filed August 5,

1930, by the assignee, The Babcoclc eh Wilcox Company. Hereby entersthis disclaimer to that part of the claims in said specification, whichare in the following words, to wit:

5. In combination, means defining a gas pass, a connection having a tubejoined thereto at one end andextending into said pass, said tube beingcoated with noncorrodible material w1th1n the pass but uncoated withsaid material where it is joined to the connection.

7. In combination, two tubes extending into a gas pass and having endsdisposed outside of said pass on one side thereof, and aconnection alsodisposed outside of said pass and joining said tube ends, said tubesbeing coated with non-corrodible material within the pass but uncoatedwhere they are joined to said connection.

[Ofiicial Gazette August 26, 1.930.]

